Just a suggestion, I have not read it elsewhere yet.
• Would it be possible to set the 'custom banner images' under the navigation bar to be triggered by Mediawiki:Categories AS WELL AS pages, as at present?
At present you have a neat system that triggers a page by checking image against page names (I have not had a look at this but have to think this must be quite easy to do) the suggestion is ...
• Would it be possible to have that triggered by the page's category name and/or instead?
What I am thinking about here are two potentials,
- one) to have category images which help user's visual navigation, and
two) a rudimentary 'banner add' type application where a site owner could allow chosen users to have a controlled banner ad above their page.
Of course, the last option could either be a paid for service or out of courtesy and good design.
(I am developing a NPO directory website, this could all be very useful for us and I really like the actions and designs of the skin).